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Commit 2a005855 authored by Steven Whitehouse's avatar Steven Whitehouse
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GFS2: Separate LRU scanning from shrinker 



This breaks out the LRU scanning function from the shrinker in
preparation for adding other callers to the LRU scanner.

Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
parent 6abb7c25

fs/gfs2/glock.c

+17 −11
Original line number Diff line number Diff line
@@ -1376,23 +1376,19 @@ void gfs2_glock_complete(struct gfs2_glock *gl, int ret) 
		gfs2_glock_put(gl);

}



/**

 * gfs2_scan_glock_lru - Scan the LRU looking for locks to demote

 * @nr: The number of entries to scan

 *

 */



static int gfs2_shrink_glock_memory(struct shrinker *shrink,

				    struct shrink_control *sc)

static void gfs2_scan_glock_lru(int nr)

{

	struct gfs2_glock *gl;

	int may_demote;

	int nr_skipped = 0;

	int nr = sc->nr_to_scan;

	gfp_t gfp_mask = sc->gfp_mask;

	LIST_HEAD(skipped);



	if (nr == 0)

		goto out;



	if (!(gfp_mask & __GFP_FS))

		return -1;



	spin_lock(&lru_lock);

	while(nr && !list_empty(&lru_list)) {

		gl = list_entry(lru_list.next, struct gfs2_glock, gl_lru);
@@ -1425,7 +1421,17 @@ static int gfs2_shrink_glock_memory(struct shrinker *shrink, 
	list_splice(&skipped, &lru_list);

	atomic_add(nr_skipped, &lru_count);

	spin_unlock(&lru_lock);

out:

}



static int gfs2_shrink_glock_memory(struct shrinker *shrink,

				    struct shrink_control *sc)

{

	if (sc->nr_to_scan) {

		if (!(sc->gfp_mask & __GFP_FS))

			return -1;

		gfs2_scan_glock_lru(sc->nr_to_scan);

	}



	return (atomic_read(&lru_count) / 100) * sysctl_vfs_cache_pressure;

}